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Bladder tumors develop after the diagnosis of upper urinary tract carcinoma in approximately 20% of cases, whereas the incidence of upper urinary tract tumor after the diagnosis of bladder cancer is low, approximately 2%. In a 64-year-old man who had undergone cystoprostatectomy treatment of bladder carcinoma 6 years previously, with the sigmoid conduit used for supravesicle diversion, a transitional cell carcinoma that developed in the conduit was not revealed with intravenous pyelography at regular follow-up intervals. The patient had only hematuria. After an obstructed left kidney, left ureteral stricture, and a filling defect in the conduit were observed radiologically and biopsy revealed a transitional cell cacinoma at the ureterosigmoid junction, the patient underwent left nephroureterectomy, partial resection of a third of the sigmoid conduit, and right ureteral reimplantation. The occurrence of upper urinary tract carcinoma after treatment of bladder cancer should be considered even in light of intravenous pyelography that shows no abnormality; and when such carcinomas occur in this situation, disease involving the conduit should be ruled out.

Transitional cell carcinoma of the distal portion of ureter protruding into the sigmoid conduit six years after cystoprostatectomy